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Cisco Support CommunityExpert Series WebcastBorder Gateway Protocol (BGP)Fundamentals and TroubleshootingVinit Jain, CCIE Security, Data Center, SP, and R&SJanuary 12, 2016

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Cisco Support Community Expert Series WebcastVinit JainCCIE Security, Data Center SP and R&S#22854Vinit’s Twitter – twitter.com/vinugenieVinit’s Facebook - https://www.facebook.com/vinu.genieCisco Live Event - BRKRST–3320 (Cisco Live /cleu16.jsp?search brkrst-3320

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Cisco Support CommunityExpert Series WebcastBorder Gateway Protocol (BGP)Fundamentals and TroubleshootingVinit Jain, CCIE Security, Data Center, SP, and R&SJanuary 12, 2016

Agenda BGP Fundamentals BGP Refresher BGP neighbor relationships BGP Prefix advertisement BGP Filtering and route policy BGP Community BGP Troubleshooting BGP Peering IssuesMissing BGP Routes

How big is the Internet Routing Table?PollingQuestion 1A. 250,000B. 500,000C. 400,000D. 600,000

Routing with BGPProtocol overview Defined in RFC 4271 – Path Vector protocol with high scalability andflexibility BGP is primarily used to provide inter-AS connectivity No periodic routing updates – scalability Neighbors are established over TCP port 179 Same AS is iBGP, different AS is eBGP Support for multiple address-families (MP-BGP)AS 65534eBGP IPv4, IPv6, VPNv4, MDT, L2VPN, etciBGPAS 65535iBGP

Routing with BGPProtocol overview Path Attributes are associated with each network path to control routingpolicyo Well-known (mandatory, discretionary)o Optional (transitive, non-transitive) Uses a path selection algorithm to determine which prefix is best AS PATH attribute used for loop preventionAS 65534eBGPiBGPAS 65535iBGP

Routing with BGPProtocol overview Route propagation eBGP learned route is advertised to iBGP peers and eBGP peers iBGP learned route is advertised to eBGP peers iBGP must have a full mesh of peers (Confederation or RR can be used) BGP holds prefixes in its own table (BGP table – show ip bgp) Only the ‘best’ path is advertised to neighbors or installed in the RIB by default eBGP route adv. to iBGP peer – next-hop is the eBGP neighborAS 65534 Message types OPEN, UPDATE, NOTIFICATION, KEEPALIVE, ROUTE REFRESHeBGP Keepalive timer is 60 holdtimer is 180 May require another protocol to provide NH reachabilityiBGPAS 65535iBGP

Routing with BGPNeighbor 5AS65534R2#debug ip bgpR3#debug ip bgp*Mar 23 20:45:18.184: BGP: 10.23.23.3 passive went from Idle to Connect*Mar 23 20:45:18.180: BGP: 10.23.23.2 active went from Idle to Active*Mar 23 20:45:18.208: BGP: 10.23.23.3 passive went from Connect toOpenSent*Mar 23 20:45:18.184: BGP: 10.23.23.2 active went from Active toOpenSent*Mar 23 20:45:18.208: BGP: 10.23.23.3 passive sending OPEN, version 4,my as: 65535, holdtime 180 seconds, ID 2020202*Mar 23 20:45:18.184: BGP: 10.23.23.2 active sending OPEN, version 4,my as: 65534, holdtime 180 seconds, ID 3030303*Mar 23 20:45:18.208: BGP: 10.23.23.3 passive went from OpenSent toOpenConfirm*Mar 23 20:45:18.204: BGP: 10.23.23.2 active went from OpenSent toOpenConfirm*Mar 23 20:45:18.208: BGP: 10.23.23.3 passive went from OpenConfirm toEstablishedR2#show tcp briefTCBLocal AddressForeign Address(state)09BAD1E0 10.23.23.2.17910.23.23.3.21995ESTAB070A2910 2.2.2.2.296511.1.1.1.179ESTABR2#*Mar 23 20:45:18.204: BGP: 10.23.23.2 active went from OpenConfirm toEstablishedR3#show tcp briefTCBLocal AddressForeign Address(state)09AC7AD0 10.23.23.3.2199510.23.23.2.179ESTAB

Routing with BGPNeighbor ow ip bgp summaryBGP router identifier 2.2.2.2, local AS number 65535BGP table version is 1, main routing table version AS65534R3#show ip bgp summaryBGP router identifier 3.3.3.3, local AS number 65534BGP table version is 1, main routing table version 1AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down65535757565534444410100 01:05:040 00:36:250Interesting fields:0NeighborVState/PfxRcd10.23.23.24R3#AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down655354544100 00:36:570 InQ/OutQ- Number of messages queued from/to the peer Neighbor – IP address of the BGP peer UP/Down – Time in the current state AS – Autonomous system of the peer TblVer – BGP table version advertised to that peerState/PfxRcd – Current state of the peer and number ofprefixes received from the peer

Routing with BGPPrefix advertisement – getting routes into P prefixes are injected by explicit configurationInboundPolicy Network statement - network prefix mask mask - Prefix/mask needs to match the RIB exactly- Does not enable BGP on an interface like IGP’s Redistribution – redistribute ospf PID - Injects prefixes from the specified protocolBest PathBGP TableRIBOutboundpolicy- Does not inject 0.0.0.0/0 Aggregate route – aggregate-address prefix mask - Component route must exist in BGP- Aggregator attribute is added Default route – default-information originatePeer

Routing with BGPPrefix advertisement – getting routes into BGPR2#show ip bgp 3.3.3.3BGP routing table entry for 3.3.3.3/32, version 2Paths: (1 available, best #1, table default)Advertised to update-groups:2Refresh Epoch 16553410.23.23.3 from 10.23.23.3 (3.3.3.3)Origin IGP, metric 0, localpref 100, valid, external, bestR2#show ip bgp neighbors 1.1.1.1 advertised-routesBGP table version is 2, local router ID is 2.2.2.2Status codes: s suppressed, d damped, h history, * valid, best, i internal,r RIB-failure, S Stale, m multipath, b backup-path, f RTFilter,x best-external, a additional-path, c RIB-compressed,Origin codes: i - IGP, e - EGP, ? - incompleteRPKI validation codes: V valid, I invalid, N Not foundNetwork* 3.3.3.3/32Next Hop10.23.23.3Metric LocPrf Weight Path00 65534 how ip bgp 3.3.3.3% Network not in tableR3#conf tEnter configuration commands, one per line. End with CNTL/Z.R3(config)#router bgp 65534R3(config-router)#network 3.3.3.3 mask 255.255.255.255R3(config-router)#endR3#show ip bgp 3.3.3.3BGP routing table entry for 3.3.3.3/32, version 2Paths: (1 available, best #1, table default)Advertised to update-groups:1Refresh Epoch 1Local0.0.0.0 from 0.0.0.0 (3.3.3.3)Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced, local,best

Routing with BGPPrefix advertisement – Route Policy and 5534BGP policies determine what prefixes are permitted or denied and can modify path attributes Policies are configured per-neighbor, and can be inbound or outbound Neighbor IP distribute-list X in/out - X Access-list, filters routes in or out Neighbor IP prefix-list X in/out - X prefix-list name, similar to distribute list (mutually exclusive) Neighbor IP filter-list x in/out - X “ip as-path access-list”, filters by AS PATH attribute Neighbor IP route-map x in/out - X Route-map, extremely versatile, can modify attributes and filter

Routing with BGPPrefix advertisement – Route Policy 65535R2#show ip bgp 3.0.0.0BGP routing table entry for 3.0.0.0/24, version 3Paths: (1 available, best #1, table default)Advertised to update-groups:2Refresh Epoch 36553410.23.23.3 from 10.23.23.3 (3.3.3.3)Origin IGP, metric 0, localpref 100, valid, external, bestR2#show ip bgp 3.0.1.0BGP routing table entry for 3.0.1.0/24, version 7Paths: (1 available, best #1, table default)Advertised to update-groups:2Refresh Epoch 36553410.23.23.3 from 10.23.23.3 (3.3.3.3)Origin IGP, metric 0, localpref 200, valid, external, best3.0.1.0/243.0.2.0/24AS65534 3.0.3.0/24Router 2router bgp 65535bgp router-id 2.2.2.2bgp log-neighbor-changesneighbor 1.1.1.1 remote-as 65535neighbor 1.1.1.1 update-source Loopback0neighbor 10.23.23.3 remote-as 65534neighbor 10.23.23.3 route-map local-pref in!ip forward-protocol nd!!no ip http serverno ip http secure-server!!ip prefix-list lp-as65534-in seq 5 permit 3.0.1.0/24!route-map local-pref permit 10match ip address prefix-list lp-as65534-inset local-preference 200!route-map local-pref permit 20!

Routing with BGPUsing policy to influence trafficOutbound policy to influence incoming traffic Neighboring AS can make their own policy which makes thischallenging AS PATH pre-pending – Makes a particular path look better orworse to the rest of the worldInbound policy to influence outgoing traffic Weight Local Preference Community can be set incoming to allow granular control andeasier policy management

Routing with BGPBGP .0/24R2#show ip bgpBGP table version is 56, local router ID is 2.2.2.2Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,x best-external, a additional-path, c RIB-compressed,Origin codes: i - IGP, e - EGP, ? - incompleteRPKI validation codes: V valid, I invalid, N Not foundR3# show ip bgpBGP table version is 59, local router ID is 3.3.3.3Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,x best-external, a additional-path, c RIB-compressed,Origin codes: i - IGP, e - EGP, ? - incompleteRPKI validation codes: V valid, I invalid, N Not foundNetworkNext Hop* i 3.0.0.0/2410.45.45.5* 10.23.23.3* i 3.0.1.0/2410.45.45.5* 10.23.23.3* i 3.0.2.0/2410.45.45.5* 10.23.23.3* i 3.0.3.0/2410.45.45.5* 10.23.23.3* i 111.111.111.0/24 1.1.1.1NetworkNext Hop* i 3.0.0.0/245.5.5.5* 0.0.0.0* i 3.0.1.0/245.5.5.5* 0.0.0.0* i 3.0.2.0/245.5.5.5* 0.0.0.0* i 3.0.3.0/245.5.5.5* 0.0.0.0* i 111.111.111.0/24 10.45.45.4* 10.23.23.2Metric LocPrf Weight Path0 1000 65534 i00 65534 i0 1000 65534 i00 65534 i0 1000 65534 i00 65534 i0 1000 65534 i00 65534 i0 1000iMetric LocPrf Weight Path0 1000i032768 i0 1000i032768 i0 1000i032768 i0 1000i032768 i0 1000 65535 i0 65535 i

Routing with BGPBGP Next-Hop111.111.111.0/24R1R1#show ip route 3.0.2.0% Network not in tableR1#show ip bgp 3.0.2.0BGP routing table entry for 3.0.2.0/24, version 0Paths: (2 available, no best path)Flag: 0x820Not advertised to any peerRefresh Epoch 26553410.23.23.3 (inaccessible) from 2.2.2.2 (2.2.2.2)Origin IGP, metric 0, localpref 100, valid, internalrx pathid: 0, tx pathid: 0Refresh Epoch 26553410.45.45.5 (inaccessible) from 4.4.4.4 (4.4.4.4)Origin IGP, metric 0, localpref 100, valid, internalrx pathid: 0, tx pathid: 4EBGPR510.45.45.0/24R1#show ip route 10.23.23.3% Subnet not in table3.0.3.0/24

Routing with BGPNeighbor x.x.x.x next-hop-self111.111.111.0/24R1R1#show ip bgp 3.0.2.0BGP routing table entry for 3.0.2.0/24, version 5Paths: (2 available, best #1, table default)Not advertised to any peerRefresh Epoch 2655342.2.2.2 (metric 11) from 2.2.2.2 (2.2.2.2)Origin IGP, metric 0, localpref 100, valid, internal,bestrx pathid: 0, tx pathid: 0x0Refresh Epoch 2655344.4.4.4 (metric 11) from 4.4.4.4 (4.4.4.4)Origin IGP, metric 0, localpref 100, valid, internalrx pathid: 0, tx pathid: IBGPIBGPEBGPIBGPR5AS65535R410.45.45.0/24#neighbor 1.1.1.1 next-hop-self

Routing with 0.23.23.0/24R2R3IBGPIBGPR4R510.45.45.0/24R1#show ip bgp 3.0.2.0BGP routing table entry for 3.0.2.0/24, version 9Paths: (2 available, best #2, table default)Not advertised to any peerRefresh Epoch 265534 65534 65534 655342.2.2.2 (metric 11) from 2.2.2.2 (2.2.2.2)Origin IGP, metric 0, localpref 100, valid, internalrx pathid: 0, tx pathid: 0Refresh Epoch 2655344.4.4.4 (metric 11) from 4.4.4.4 (4.4.4.4)Origin IGP, metric 0, localpref 100, valid, internal, bestrx pathid: 0, tx pathid: 4EBGP3.0.3.0/24!hostname R3!router bgp 65534bgp router-id 3.3.3.3bgp log-neighbor-changesnetwork 3.0.0.0 mask 255.255.255.0network 3.0.1.0 mask 255.255.255.0network 3.0.2.0 mask 255.255.255.0network 3.0.3.0 mask 255.255.255.0neighbor 5.5.5.5 remote-as 65534neighbor 5.5.5.5 update-source Loopback0neighbor 10.23.23.2 remote-as 65535neighbor 10.23.23.2 route-map prepend out!!ip as-path access-list 1 permit !!route-map prepend permit 10match as-path 1set as-path prepend 65534 65534 65534!route-map prepend permit 20!

Validating prefix 45.45.0/24R1#show ip bgp neighbors 2.2.2.2 routesBGP table version is 28, local router ID is 1.1.1.1Status codes: s suppressed, d damped, h history, * valid, best, i internal,r RIB-failure, S Stale, m multipath, b backup-path, f RTFilter,x best-external, a additional-path, c RIB-compressed,Origin codes: i - IGP, e - EGP, ? - incompleteRPKI validation codes: V valid, I invalid, N Not foundR2#show ip bgp neighbors 1.1.1.1 advertised-routesBGP table version is 80, local router ID is 2.2.2.2Status codes: s suppressed, d damped, h history, * valid, best,i - internal,r RIB-failure, S Stale, m multipath, b backup-path, f RTFilter,x best-external, a additional-path, c RIB-compressed,Origin codes: i - IGP, e - EGP, ? - incompleteRPKI validation codes: V valid, I invalid, N Not foundNetwork* i 3.0.0.0/24* i 3.0.2.0/24Network* 3.0.0.0/24* 3.0.2.0/24Next Hop2.2.2.22.2.2.2Total number of prefixes 2Metric LocPrf Weight Path0 2000 65534 i0 2000 65534 iNext Hop10.23.23.310.23.23.3Total number of prefixes 2R2#Metric LocPrf Weight Path0 2000 65534 i0 2000 65534 i

PollingQuestion 2Which protocol would you prefer forcarrying Internet Routing Table?A. OSPFB. EIGRPC. BGPD. IS-IS

Scenario 1 - Failed BGP PeeringProblem Description iBGP / eBGP is not establishing Newly configured BGP session not coming up Session was up before, but not coming up nowOSPFR1iBGPOSPFR2AS65535eBGPPhysical TopologyR3AS65534R1iBGPR2eBGPAS65535Logical TopologyR3AS65534

Failed BGP peeringConfigurationOSPFR1iBGPR2eBGPAS65535router bgp 65535bgp router-id 2.2.2.2bgp log-neighbor-changesneighbor 1.1.1.1 remote-as 65535neighbor 1.1.1.1 update-source Loopback0neighbor 10.23.23.3 remote-as 65534. . .R3AS65534Check AS Numbers Peering IP eBGP Multihop?router bgp 65534bgp router-id 3.3.3.3bgp log-neighbor-changesneighbor 10.23.23.2 remote-as 65535. . .

Failed BGP peeringReachabilityR1# ping 2.2.2.2Sending 5, 100-byte ICMP Echos to 2.2.2.2,timeout is 2 seconds:Lo0 1.1.1.1/32R1AS65535RnPacket sent with a source address of 10.12.12.1!!!!!Success rate is 0 percent (0/5)R1# ping 2.2.2.2 source loopback0Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:Packet sent with a source address of 1.1.1.1.Success rate is 0 percent (0/5)Lo0 2.2.2.2/32R2

Failed BGP peeringVerify any Firewall / ACL in path for TCP port 179ASA FW# sh run access-listaccess-list OUT extended permit icmp any anyaccess-list OUT extended permit ospf any anyAS65535AS65534R3R2access-list OUT extended permit tcp any any eq telnet. . . .Rn# sh ip access-list R1 R2Lo0 1.1.1.1/32AS65535Lo0 2.2.2.2/32permit icmp any anypermit ospf any anyR1RnR2permit tcp host 10.12.12.1 eq bgp 2.2.2.2permit tcp host 10.12.12.1 2.2.2.2 eq bgp. . . .ACL

Failed BGP peeringVerify TCP sessionR2#sh tcp briefTCBLocal Address65F19834 2.2.2.2.179Foreign Address1.1.1.1.46523(state)ESTABQuick test when BGP is downR1#telnet 2.2.2.2 179 /source-interface loopback 0Trying 2.2.2.2 .% Destination unreachable; gateway or host downR1# This means BGP Packets are being blocked between R1 and R2

Failed BGP peeringBlocked process in XR EnsureBGP process is in Runstate. Checkfor blocked BGP orTCP process on the RP / LCusing show process blockedcommand.RP/0/RSP0/CPU0:ASR9010-B# show process bgpMon Jun 3 09:47:12.646 ESTJob Id: 1040PID: 307494Executable path: /disk0/iosxr-routing4.2.3/bin/bgpInstance #: 1Version ID: 00.00.0000Respawn: ONRespawn count: 1Max. spawns per minute: 12Last started: Tue May 28 14:35:502013Process state: RunPackage state: NormalStarted on config: default. . . .

Failed BGP peeringShow process bgp (contd. Output)RP/0/RSP0/CPU0:ASR9010-B# show process bgp snip 102 488K 10 Nanosleep0:00:02:00040:00:00:0847 bgp1049133 488K 10 Receive0:00:00:08116:36:52:0264 bgp1049143 488K 10 Condvar14:56:55:02369:07:49:0890 bgp1049150 488K 10 Condvar14:56:55:024025:09:49:0542 bgp1049163 488K 10 Running0:00:00:000057:53:33:0110 bgp1049171 488K 10 Receive0:00:28:03790:00:00:0066 bgp1049181 488K 10 Mutex13:15:50:08703:31:49:0712 bgp snip You can also use “show process blocked” to checkthe blocked processes

Failed BGP peeringSniffer CaptureUse SPAN to get traffic to your sniffer- monitor session 1 source interface Te2/4 rx- monitor session 1 destination interface Te2/2IOS-XR- Only supported on ASR-9000- Use ACLs to control what packets to SPANRSPAN- “RSPAN has all the features of SPAN, plus support for source ports and destination ports that aredistributed across multiple switches, allowing one to monitor any destination port located on the RSPANVLAN. Hence, one can monitor the traffic on one switch using a device on another switch.”

Failed BGP peeringWireshark

Failed BGP peeringPlatform Specific Packet Capture ToolsIOS Embedded Packet Capture6500 / 7600 ELAM NETDR Capture MPA (Mini Protocol Analyzer)ASR9000 Network Processor CaptureNexus (7k, 5k, 3k) Ethanalyzer ElamFor yourreference only

Scenario 2 – Missing RoutesProblem Description Routes advertised were not learnt on peer router Symptoms Traffic Loss / No Traffic for the prefix42

Scenario 2 – Missing RoutesUpdate Filtering Types of filters Prefix filters AS PATH filters Community filters Route-maps Applied in/out direction43

Scenario 2 – Missing RoutesUpdate Filters Determine which filters are applied to the BGP session Show ip bgp nei x.x.x.x Show run include neighbor x.x.x.x Examine the route and pick out the relevant attributes Show ip bgp y.y.y.y Compare the attributes against the filtersAS65535R110.1.1.0/24 ?R210.1.1.0/24R1#show ip bgp neigh 2.2.2.2 routesTotal number of prefixes 044

Scenario 2 – Missing RoutesCommunity ProblemsR2#show run begin bgprouter bgp 2network 10.1.1.0 mask 255.255.255

Routing with BGP Defined in RFC 4271 –Path Vector protocol with high scalability and flexibility BGP is primarily used to provide inter-AS connectivity No periodic routing updates –scalability Neighbors are established over TCP port 179 Same AS is iBGP, different AS is eBGP Support for multiple address-families (MP-BGP) IP

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